Stephen Martin, at right in the green wig, with friends and members of a group that included a man who later punched Martin, causing him to hit his head on the ground and lose consciousness. Martin never recovered from the post-Bay to Breakers attack May 20, 2012, and died June 8, 2012.

Photo: San Francisco Police Department

Stephen Martin, at right in the green wig, with friends and members...

Stephen Martin, at right in the green wig, with friends and members... Photo-4640973.62550 - SFGate

Image 2 of 3

Stephen Martin, at right in the green wig, with friends and members of a group that included a man who later punched Martin, causing him to hit his head on the ground and lose consciousness. Martin never recovered from the post-Bay to Breakers attack May 20, 2012, and died June 8, 2012.

Photo: San Francisco Police Department

Stephen Martin, at right in the green wig, with friends and members...

Stephen Martin, at right in the green wig, with friends and members... Photo-4640974.62550 - SFGate

Image 3 of 3

SFPD Commander of Investigation, John Loftus, spoke at a Press Conference for Stephen Martin's case at the Hall of Justice on Monday, June 11, 2012, in San Francisco, Calif.

SFPD Commander of Investigation, John Loftus, spoke at a Press...

SFPD Commander of Investigation, John Loftus, spoke at a Press... Photo-4640975.62550 - SFGate